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(No Model.)

I. F. TUCKER.

MBGHANIGAL TELEPHONE. N0.`308.582. Patented Nov. 25, 18847.

UNITED STATES PATENT OEEICEo IRETT F. TUCKER, OF SUMNER, MICHIGAN, ASSIGNOR OF ONE-HALF 'IO MORRIS IV. TUCKER, OF SAME PLACE.

MECHANICAL TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 308,582, dated November 25, 1 884.

(No model.)

To all whom, it may concern.-

Be it known that I, IRETT F. TUCKER, of Sumner, county of Gratiot, State of Michigan, have invented a new and useful Improvement in Mechanical Telephones, and I do hereby declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings,which form a part of this specification.

My invention consists in the combination of devices and appliances, hereinafter specified, and more particularlypointed out in the claims. v

In the drawings, Figure l is a section of a device embodying my invention. Fig. 2 is a plan view of the same with the diaphragm removed.

My invention relates to mechanical telephones, and has for its object an improved transmitter and receiver which shall be especially sensitive and respond more satisfactorily in the conveyance of messages over the transmitting-wire.

It consists, essentially, of a metallic diaphragm supported at or near its periphery upon an edge of the bowl, said bowl constructed with a cup-shaped sounding-chamber back of the diaphragm and a cup-shaped projection in front of the diaphragm.

I carry out my invention as follows:

In the drawings, Arepresents the bowl,con structed of any suitable material, said bowl provided with the outer cup-shaped orifice, A', in front of thediaphragm,anda cup-shaped soundingchamber, AZ, back of the diaphragm. The periphery of the sounding-chamber A terminates in a sharp edge, a, the orice A being cut down sufficiently upon its exterior to form said edge and a depression shown at a. Iprefer to make the sounding-chamber A2 of circular form.

Bis the diaphragm, made of any suitable material, preferably of copper. This diaphragmrests upon edge a ofthe bowl, its periphery being flanged as shown, the iiange entering into the depression a of the orifice A.

O is a button, preferably made of copper, concaved on its under surface.

D is the transmitting-wire, connected with said button and passing through the diaphragm and the channel a2 of the bowl to the opposite transmitter.

E represents sounding-posts secured in the bowl beneath or back of thc diaphragm.

F represents studs adapted to hold the transmitter away from the wall or easing G on which the instrument rests, so that there will be no deadening ofthe sound, and permitting the bowl to be secured at any desired angle to the wall or casing.

I do not confine myself to any specific shape of the chambers A and A2, nor do I limit myself to the construction of the bowl with the chamber A in connection with the other features of the apparatus, as they may be used without said orifice, although by constructing the bowl therewith the sound in receiving is projected more satisfactorily into the room, and it aids also in receiving the message. By locating the diaphragm upon the sharp edge a the sound is made clearer and of better tone, while the flange stiffcns the metal and causes it to remain more steadily in position.

l. A mechanical telephone transmitter and receiver constructed with the sounding-chambers A2 back of the diaphragm, said chamber terminating with an edge, and in combination therewith adiaphragm resting upon said edge, substantially as described.

2. A mechanical telephone transmitter and receiver constructed with the sounding-chambers A2 terminating with a sharpened edge, and in combination therewith a diaphragm resting upon said edge, a transmitting-wire connected with said diaphragm and passed through an orice, a2, of the bowl, substantially as described.

3. A mechanical telephone transmitter and receiver constructed with a sounding-chamber, A2, back ofthe diaphragm, and provided with an outer edge, a, a diaphragm resting upon said edge, and a chamber, A', in front of said diaphragm, substantially as described.

4. A mechanical telephone transmitter and receiver constructed with a bowl, A, having a sounding-chamber, A2, an orifice, a, therein and terminating with an cdge,with diaphragm IOO resting upon said edge, said chamber provided with sounding-posts located back of the diaphragm, substantially as described.

5. A mechanical telephone transmitter and receiver constructed with a sounding-chamber, A2, an oriee, a2, said chamber constructed with an edge, a diaphragm resting upon said edge, a transmitting-wire secured to said diaphragm, and in connection therewith the studs F, substantially as described.

6. A mechanical telephone transmitter and receiver constructed with the sounding-chamber A2 terminating in an edge, and in connection therewith a diaphragm of copper resting upon said edge and providedwith atransmitting-Wire, substantially as described.

7. A mechanical telephone transmitter and receiver constructed with a sounding-chamber, said chamber terminating with an edge, and in combination therewith a diaphragm resting upon said edge, said diaphragm provided With a lange extending over said edge, substantially as described.

In testimony Whereoil sign this specification in the presence of two Witnesses.

IRETT F. TUCKER.

Witnesses:

SAMUEL BrenLoW, Monnrs W. TUCKER. 

